Er~(3+)-doped tellurite glass waveguides produced by Fiber On Glass (FOG) method

摘要

In this work we used a Thermal Mechanic Analysis equipment to produce the channel FOG waveguides by pressing an Er~(3+) doped tellurite glass optical fiber against one Er~(3+) ion doped tellurite glass substrate kept under T_c ± 30℃ (T_c = soft point). The luminescence and waveguide refractive index were measured. Scanning electron microscopy was used to observe the obtained structure. The objective is to produce a new concept in components of integrated optical circuits. Then this work report the production of Er~(3+)-doped tellurite glass channel waveguides using the novel concept of Benson et al of fiber on glass (FOG). To succeed with this technique it is important to correlate the main thermo-physical characteristics of the substrate and the fiber, which are the transition temperature T_g, the temperature of the onset of crystallization T_x, the maximum crystallization temperature T_c and the thermal expansion coefficient. The T_g, T_x and T_c values were determined by Differential Thermal Analysis (DTA), while the thermal expansion coefficient was determined by Thermal Mechanical Analysis (TMA). For the FOG purpose the thermal stability range, T_x - T_g, is an important temperature region which defines if the glass will have enough viscosity to shape in the FOG concept.